Simulation study on control of spill structure of slow extracted beam from a medical synchrotron with feed-forward and feedback using a fast quadruple magnet and RF-knockout system

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• 作者：Ryo Muraoka ; Tetsuya Nakanishi ; ^{nakanishi.tetsuya@nihon-u.ac.jp}
• 关键词：Slow beam extraction ; Synchrotron ; RF-knockout ; QAR ; Feedback control ; Feed-forward control
• 刊名：Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
• 出版年：2017
• 出版时间：21 February 2017
• 年：2017
• 卷：846
• 期：Complete
• 页码：81-86
• 全文大小：1143 K
• 卷排序：846

文摘

A feedback control of the spill structure for the slow beam extraction from the medical synchrotron using a fast quadruple and radio frequency (RF)-knockout (QAR method) is studied to obtain the designed spill structure. In addition the feed-forward control is used so that the feedback control is performed effectively. In this extraction method, the spill of several ms are extracted continuously with an interval time of less than 1 ms. Beam simulation showed that a flat spill structure was effectively obtained with feed-forward and feedback control system as well as a step-wise structure which is useful for the shortening of an irradiation time in a spot scanning operation. The effect of current ripples from main quadruple magnet's power supplies could be also reduced with the feedback control application.